/*
 * Copyright (C) 2008 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing.google;

import static com.google.common.collect.testing.features.CollectionSize.ONE;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.HashMultiset;
import com.google.common.collect.Multiset;
import com.google.common.collect.Multisets;
import com.google.common.collect.testing.features.CollectionSize;
import org.junit.Ignore;

/**
 * A generic JUnit test which tests multiset-specific read operations. Can't be invoked directly;
 * please see {@link com.google.common.collect.testing.SetTestSuiteBuilder}.
 *
 * @author Jared Levy
 */
@GwtCompatible
@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
public class MultisetReadsTester<E> extends AbstractMultisetTester<E>
{

    @CollectionSize.Require(absent = ZERO)
    public void testElementSet_contains()
    {
        assertTrue(
                "multiset.elementSet().contains(present) returned false",
                getMultiset().elementSet().contains(e0()));
    }

    @CollectionSize.Require(absent = ZERO)
    public void testEntrySet_contains()
    {
        assertTrue(
                "multiset.entrySet() didn't contain [present, 1]",
                getMultiset().entrySet().contains(Multisets.immutableEntry(e0(), 1)));
    }

    public void testEntrySet_contains_count0()
    {
        assertFalse(
                "multiset.entrySet() contains [missing, 0]",
                getMultiset().entrySet().contains(Multisets.immutableEntry(e3(), 0)));
    }

    public void testEntrySet_contains_nonentry()
    {
        assertFalse(
                "multiset.entrySet() contains a non-entry", getMultiset().entrySet().contains(e0()));
    }

    public void testEntrySet_twice()
    {
        assertEquals(
                "calling multiset.entrySet() twice returned unequal sets",
                getMultiset().entrySet(),
                getMultiset().entrySet());
    }

    @CollectionSize.Require(ZERO)
    public void testEntrySet_hashCode_size0()
    {
        assertEquals(
                "multiset.entrySet() has incorrect hash code", 0, getMultiset().entrySet().hashCode());
    }

    @CollectionSize.Require(ONE)
    public void testEntrySet_hashCode_size1()
    {
        assertEquals(
                "multiset.entrySet() has incorrect hash code",
                1 ^ e0().hashCode(),
                getMultiset().entrySet().hashCode());
    }

    public void testEquals_yes()
    {
        assertTrue(
                "multiset doesn't equal a multiset with the same elements",
                getMultiset().equals(HashMultiset.create(getSampleElements())));
    }

    public void testEquals_differentSize()
    {
        Multiset<E> other = HashMultiset.create(getSampleElements());
        other.add(e0());
        assertFalse("multiset equals a multiset with a different size", getMultiset().equals(other));
    }

    @CollectionSize.Require(absent = ZERO)
    public void testEquals_differentElements()
    {
        Multiset<E> other = HashMultiset.create(getSampleElements());
        other.remove(e0());
        other.add(e3());
        assertFalse("multiset equals a multiset with different elements", getMultiset().equals(other));
    }

    @CollectionSize.Require(ZERO)
    public void testHashCode_size0()
    {
        assertEquals("multiset has incorrect hash code", 0, getMultiset().hashCode());
    }

    @CollectionSize.Require(ONE)
    public void testHashCode_size1()
    {
        assertEquals("multiset has incorrect hash code", 1 ^ e0().hashCode(), getMultiset().hashCode());
    }
}
